//*********************************************************************
// Average.java   Java  Foundations
//
// Demonstrates the use of a while loop,a sentinel value,anda
// running sum
//*********************************************************************
import java.text.DecimalFormat;
import java.util.Scanner;

public class Average
{
  //---------------------------------------------------------------
  // Computes the average of a set of values entered by the users.
  // The running sun is println as the numbers are entered.
  //---------------------------------------------------------------
  public static void main (String[] args)
   {
     int sum = 0, value, count = 0;
     double average;
   
     Scanner scan = new Scanner (System.in);

     System.out.print ("Enter an integer ( 0 to quit): ");
     value = scan.nextInt();
 
     while (value != 0) // sentinel value of 0 to terminate loop
     {
       count++;

       sum += value;
       System.out.println ("The sum so far is " + sum);
 
       System.out.print ("Enter an integer (0 to quit): ");
       value = scan.nextInt();
     }
     System.out.println ();
     
     if (count == 0)
       System.out.println ("No values were entered.");
       else 
       {
          average = (double)sum / count;
          DecimalFormat fmt = new DecimalFormat ("0.###");
          System.out.println ("The average is " + fmt.format(average));
       }
    }
}
